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Implement a Dynamic Array Vector

Bloomberg LP● MediumNEW GRADPHONE SCREEN

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Problem statement

Implement a vector with a manually managed backing array. Process parallel operations and arguments:

append [value]: add a value.
get [index]: return the value.
set [index,value]: replace a value.
pop []: remove and return the last value.
size []: return the current size.

Return one string per command, using "null" for append and set. Grow the backing capacity geometrically; do not use a built-in resizable collection for stored elements.

Function

runDynamicVector(operations: String[], arguments: int[][]) → String[]

Examples

Example 1

operations = ["append","append","get","set","pop","size"]arguments = [[4],[7],[0],[0,9],[],[]]return = ["null","null","4","null","7","1"]

The set changes the remaining first value to 9 after pop removes 7.

Constraints

At most 10^5 commands.
Indices and pop operations are valid.